CN217282203U

CN217282203U - Three-way interlocking high-voltage circuit protection control device and protection circuit

Info

Publication number: CN217282203U
Application number: CN202220564653.2U
Authority: CN
Inventors: 陈浩; 唐德平; 倪秀兵; 张书伟
Original assignee: Cowell Technology Co ltd
Current assignee: Cowell Technology Co ltd
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2022-08-23
Anticipated expiration: 2032-03-14

Abstract

A three-way interlocking high-voltage circuit protection control device and a protection circuit belong to the technical field of power equipment testing, and solve the problem of load short-circuit faults caused by electromagnetic interference, breakdown and downtime of a control program or manual misoperation; the direct current load wiring terminal and the high-power direct current power supply input terminal are arranged at two ends of the shell, a contactor main circuit, a relay control circuit and an auxiliary power supply are arranged in the shell, the output end of the auxiliary power supply is respectively connected with the contactor main circuit and the relay control circuit, the relay control circuit and the contactor main circuit are mutually interlocked, the input end of the contactor main circuit is connected with the high-power direct current power supply input terminal, and the output end of the contactor main circuit is correspondingly connected with the direct current load wiring terminal; a socket is arranged on one side of the shell and is connected with the input end of the auxiliary power supply; the button switch and the indicator light are arranged on an upper cover plate of the shell, the button switch is connected with the relay control circuit, and the indicator light is connected with the main circuit of the contactor; the device has simple structure and low cost.

Description

Three-way interlocking high-voltage circuit protection control device and protection circuit

Technical Field

The utility model belongs to the technical field of the power equipment test, a three routes interlocking high voltage circuit protection controlling means and protection circuit are related to.

Background

In a test system platform, an adaptability test device is often replaced according to different test standards of a tested piece, for example, a load at the rear end of a direct current charging pile test system is connected with a direct current programmable electronic load, a direct current resistive load and a direct current power supply; the rear end load of the DC/DC converter test system is connected with a programmable electronic load, a direct current resistive load and a battery simulator; at present, three loads are firstly connected into a system in a test item, and when corresponding load equipment needs to be switched when a test standard is changed, the three-way interlocking protection circuit control device is used for realizing safe and convenient circuit switching. Three-way interlocking ensures that each branch has and only has one-way conduction state, and avoids equipment short circuit damage caused by mismatching of direct current source output voltage and load equipment voltage caused by misoperation.

The controller of the conventional protection circuit control device mostly adopts an electronic chip circuit, a great number of electronic elements such as triodes, diodes and resistors are used in the circuit, and the circuit is used in an external environment with strong electromagnetic interference, so that the signal receiving capacity is weak, the reliability of the elements is weak, the control consistency is poor, only one path of conduction cannot be ensured, and the interlocking significance is lost.

In a conventional protection circuit control device, no matter remote control or local control is adopted in a control mode, the two or three control switches are simultaneously conducted due to risks of breakdown of a control program and manual misoperation, so that the two or three control switches are communicated with each other, short-circuit faults of a power supply and a load are caused, and even electrical equipment such as the power supply and the load is burnt.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to how design a three routes interlocking high voltage circuit protection controlling means and protection circuit to solve prior art's controlling means because electromagnetic interference, control program collapse shut down or the problem of the load short circuit trouble that artifical maloperation caused.

The utility model discloses a solve above-mentioned technical problem through following technical scheme:

a three-way interlock high voltage circuit protection control device comprising: the high-power direct-current power supply comprises a shell (10), a direct-current load wiring terminal (11), a high-power direct-current power supply input terminal (12), a socket (13), a button switch S1, a button switch S2, a button switch S3, an indicator light LED1, an indicator light LED2 and an indicator light LED 3; one end of the shell (10) is provided with a direct current load wiring terminal (11), and the other end of the shell (10) is provided with a high-power direct current power supply input terminal (12); a contactor main circuit, a relay control circuit and an auxiliary power supply DS1 are installed inside the shell (10), the output end of the auxiliary power supply DS1 is connected with the contactor main circuit and the relay control circuit respectively, the relay control circuit is connected with the contactor main circuit in an interlocking manner, the input end of the contactor main circuit is connected with a high-power direct-current power supply input terminal (12), and the output end of the contactor main circuit is correspondingly connected with a direct-current load wiring terminal (11); a socket (13) is arranged on one side of the shell (10), and the socket (13) is connected with the input end of an auxiliary power supply DS 1; button switch S1, button switch S2, button switch S3, pilot lamp LED1, pilot lamp LED2, pilot lamp LED3 install the upper cover plate at casing (10), button switch S1, button switch S2, button switch S3 be connected with relay control circuit respectively, pilot lamp LED1, pilot lamp LED2, pilot lamp LED3 be connected with the contactor main circuit respectively.

The technical scheme of the utility model contactor and relay interlock intercommunication are connected, realize multichannel high voltage circuit's interlock intercommunication control, electronic chip's application in the device has been reduced, controlling means's interference killing feature has been improved greatly, when wherein switch on all the way, even control program collapse is down or for the maloperation activation multichannel button, relay control circuit still keeps the break-make state of current contactor main circuit, all the time keep simultaneously and only be in the on-state all the way, or whole off-state, device design safety is succinct, high reliability and convenient operation, moreover, the steam generator is simple in structure, and is low in cost.

Further, the contactor main circuit comprises: a direct current contactor KM1, a direct current contactor KM2 and a direct current contactor KM 3; the direct-current contactor KM1, the direct-current contactor KM2, the A1 contact and the A3 contact of the direct-current contactor KM3 are connected with a high-power direct-current power supply input terminal (12); the direct-current load wiring terminal (11) is correspondingly connected with the A2 contact and the A4 contact of the direct-current contactor KM1, the direct-current contactor KM2 and the direct-current contactor KM3 respectively; and 3# pins of the direct current contactor KM1, the direct current contactor KM2 and the direct current contactor KM3 are connected with the negative electrode of the output end of the auxiliary power supply DS 1.

Further, the relay control circuit includes: the relay system comprises a direct-current relay KA1, a direct-current relay KA2, a direct-current relay KA3 and a direct-current relay KA 4; the 4# pins of the direct current contactor KM1, the direct current contactor KM2 and the direct current contactor KM3 are correspondingly connected with the 5# contacts of the direct current relay KA1, the direct current relay KA2 and the direct current relay KA3 respectively; 9# contacts of the direct current relay KA1, the direct current relay KA2 and the direct current relay KA3 are respectively connected with the anode of the output end of the auxiliary power supply DS 1; 1# contacts of the direct current relay KA1, the direct current relay KA2 and the direct current relay KA3 are all suspended; the 4# contact of the direct current relay KA1 is connected with the 14# pin of the direct current relay KA2, the 8# contact of the direct current relay KA1, the 14# pin of the direct current relay KA4 and the 8# contact of the direct current relay KA2 are connected together, the 12# contact of the direct current relay KA1, the 12# contact of the direct current relay KA2 and the 4# contact of the direct current relay KA3 are connected together, the 14# pin of the direct current relay KA1 is connected with the 4# contact of the direct current relay KA2, the 8# contact of the direct current relay KA3 is suspended, the 12# contact of the direct current relay KA3 is connected with the anode of the output end of the auxiliary power supply DS1, the 14# pin of the direct current relay KA3 is connected with the 4# contact of the direct current relay KA4, the 1# contact, the 5# contact, the 8# contact and the 9# contact of the direct current relay 4 are suspended, and the 12 contact of the auxiliary power supply KA1 of the direct current relay KA4 is connected with the output end of the auxiliary power supply DS1, and a pin 13# of the direct-current relay KA4 is connected with the negative electrode of the output end of the auxiliary power supply DS 1.

Furthermore, one end of each of the indicator light LED1, the indicator light LED2 and the indicator light LED3 is connected with the positive electrode of the output end of the auxiliary power supply DS1, the other ends of the indicator light LED1, the indicator light LED2 and the indicator light LED3 are respectively connected with the 1# contacts of the direct current contactor KM1, the direct current contactor KM2 and the direct current contactor KM3 correspondingly, and the 2# contacts of the direct current contactor KM1, the direct current contactor KM2 and the direct current contactor KM3 are connected with the negative electrode of the output end of the auxiliary power supply DS 1.

Furthermore, one end of each of the push-button switch S1, the push-button switch S2 and the push-button switch S3 is connected to the negative electrode of the output end of the auxiliary power supply DS1, and the other end of each of the push-button switch S1, the push-button switch S2 and the push-button switch S3 is correspondingly connected to the 13# pin of the dc relay KA1, the dc relay KA2 and the dc relay KA3, respectively.

A protection circuit applied to the three-way interlocking high-voltage circuit protection control device comprises: the contactor comprises a contactor main circuit, a relay control circuit and an auxiliary power supply DS1, wherein the output end of the auxiliary power supply DS1 is connected with the contactor main circuit and the relay control circuit respectively, and the relay control circuit is connected with the contactor main circuit in an interlocking manner.

Further, the contactor main circuit comprises: a direct current contactor KM1, a direct current contactor KM2 and a direct current contactor KM 3; the direct current contactor KM1, the direct current contactor KM2, an A1 contact and an A3 contact of the direct current contactor KM3 are connected with a high-power direct current power supply input terminal (12); the direct-current load wiring terminal (11) is correspondingly connected with the A2 contact and the A4 contact of the direct-current contactor KM1, the direct-current contactor KM2 and the direct-current contactor KM3 respectively; and 3# pins of the direct current contactor KM1, the direct current contactor KM2 and the direct current contactor KM3 are connected with the negative electrode of the output end of the auxiliary power supply DS 1.

Further, the relay control circuit includes: the direct current relay KA1, the direct current relay KA2, the direct current relay KA3 and the direct current relay KA 4; the 4# pins of the direct current contactor KM1, the direct current contactor KM2 and the direct current contactor KM3 are correspondingly connected with the 5# contacts of the direct current relay KA1, the direct current relay KA2 and the direct current relay KA3 respectively; 9# contacts of the direct current relay KA1, the direct current relay KA2 and the direct current relay KA3 are respectively connected with the anode of the output end of the auxiliary power supply DS 1; 1# contacts of the direct current relay KA1, the direct current relay KA2 and the direct current relay KA3 are all suspended; the 4# contact of the direct current relay KA1 is connected with the 14# pin of the direct current relay KA2, the 8# contact of the direct current relay KA1, the 14# pin of the direct current relay KA4 and the 8# contact of the direct current relay KA2 are connected together, the 12# contact of the direct current relay KA1, the 12# contact of the direct current relay KA2 and the 4# contact of the direct current relay KA3 are connected together, the 14# pin of the direct current relay KA1 is connected with the 4# contact of the direct current relay KA2, the 8# contact of the direct current relay KA3 is suspended, the 12# contact of the direct current relay KA3 is connected with the anode of the output end of the auxiliary power supply DS1, the 14# pin of the direct current relay KA3 is connected with the 4# contact of the direct current relay KA4, the 1# contact, the 5# contact, the 8# contact and the 9# contact of the direct current relay 4 are suspended, and the 12 contact of the auxiliary power supply KA1 of the direct current relay KA4 is connected with the output end of the auxiliary power supply DS1, and a pin 13# of the direct-current relay KA4 is connected with the negative electrode of the output end of the auxiliary power supply DS 1.

Furthermore, one end of each of the indicator light LED1, the indicator light LED2 and the indicator light LED3 is connected with the positive electrode of the output end of the auxiliary power supply DS1, the other end of each of the indicator light LED1, the indicator light LED2 and the indicator light LED3 is correspondingly connected with the 1# contact of the direct current contactor KM1, the direct current contactor KM2 and the direct current contactor KM3, and the 2# contact of each of the direct current contactor KM1, the direct current contactor KM2 and the direct current contactor KM3 is connected with the negative electrode of the output end of the auxiliary power supply DS 1.

The utility model has the advantages that:

the utility model discloses a build the logical connection between direct current contactor and the direct current relay, realize three routes high voltage circuit's interlocking intercommunication control, when wherein switch on all the way, even the control program breakdown is down, artificial maloperation activation multichannel button, interlocking circuit still keeps the break-make state of current circuit contactor, keeps three circuit all the time and is in the on-state all the way simultaneously and only all the way, or whole off-state, solves the problem that causes electrical damage because of the short circuit. Secondly, the application of the electronic chip in the device is reduced, the anti-interference capability of the control device is greatly improved, and the stability and the operation consistency of the control device are improved; the circuit topology control design is safe and simple, the operation is convenient, the structure is simple, the cost is low, the electrical device type selection is common and conventional materials, the main contactor can be replaced by a contactor with higher voltage requirement according to the actual circuit voltage requirement, the hardware interlocking safety coefficient is high, and the circuit topology control design can be flexibly applied to circuits with related switching interlocking requirements.

Drawings

Fig. 1 is a front view of a three-way interlocking high-voltage circuit protection control device according to an embodiment of the present invention;

fig. 2 is a rear front view of the three-way interlock high-voltage circuit protection control device according to the embodiment of the present invention;

fig. 3 is a schematic diagram of a protection circuit of the three-way interlocking high-voltage circuit protection control device according to the embodiment of the present invention;

fig. 4 is an internal wiring schematic diagram of a dc relay of the three-way interlocking high-voltage circuit protection control device according to the embodiment of the present invention;

fig. 5 is an internal wiring schematic diagram of the dc contactor of the three-way interlocking high-voltage circuit protection control device according to the embodiment of the present invention.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The technical solution of the present invention is further described below with reference to the drawings and specific embodiments of the specification:

example one

As shown in fig. 1 and 2, a three-way interlock high-voltage circuit protection control device includes: the high-power direct-current power supply comprises a shell 10, a direct-current load wiring terminal 11, a high-power direct-current power supply input terminal 12, a socket 13, a button switch S1, a button switch S2, a button switch S3, an indicator lamp LED1, an indicator lamp LED2 and an indicator lamp LED 3;

one end of the shell 10 is provided with 6 direct current load wiring terminals 11, and the 6 direct current load wiring terminals 11 are divided into three groups, wherein each group comprises two direct current load wiring terminals and is used as three load output ends of the device; the other end of the shell 10 is provided with 2 high-power direct-current power supply input terminals 12 for connecting a high-power direct-current power supply; a direct-current relay KA1, a direct-current relay KA2, a direct-current relay KA3, a direct-current relay KA4, a direct-current contactor KM1, a direct-current contactor KM2, a direct-current contactor KM3 and an auxiliary power supply DS1 are arranged in the shell 10; a socket 13 is installed at one side of the shell 10, the socket 13 is used for connecting a mains supply and supplying power to an auxiliary power supply DS1, and the auxiliary power supply DS1 adopts a switching power supply with +24V output; the push button switch S1, the push button switch S2, the push button switch S3, the indicator light LED1, the indicator light LED2 and the indicator light LED3 are mounted on the upper cover plate of the casing 10.

As shown in fig. 3, the positive DC + terminal of the high-power DC power supply is respectively connected to a contact a1 of the DC contactor KM1, the DC contactor KM2, and the DC contactor KM3, and the negative DC-terminal of the high-power DC input power supply is respectively connected to a contact A3 of the DC contactor KM1, the DC contactor KM2, and the DC contactor KM 3; one ends of an indicator light LED1, an indicator light LED2 and an indicator light LED3 are respectively connected with the +24V output end of the auxiliary power supply DS1, and the other ends of the indicator light LED1, the indicator light LED2 and the indicator light LED3 are respectively connected with a 1# contact of the direct current contactor KM1, a 1# contact of the direct current contactor KM2 and a 1# contact of the direct current contactor KM3 correspondingly; the 2# contact of the direct current contactor KM1, the 2# contact of the direct current contactor KM2 and the 2# contact of the direct current contactor KM3 are respectively connected with the 0V output end of an auxiliary power supply DS 1; a 3# pin of the direct current contactor KM1, a 3# pin of the direct current contactor KM2 and a 3# pin of the direct current contactor KM3 are respectively connected with a 0V output end of an auxiliary power supply DS 1; the A2 contact and the A4 of the direct current contactor KM1 are used as the power supply output end of a first load, the A2 contact and the A4 of the direct current contactor KM2 are used as the power supply output end of a second load, and the A2 contact and the A4 of the direct current contactor KM3 are used as the power supply output end of a third load; a 4# pin of the direct current contactor KM1, a 4# pin of the direct current contactor KM2 and a 4# pin of the direct current contactor KM3 are respectively and correspondingly connected with a 5# contact of the direct current relay KA1, a 5# contact of the direct current relay KA2 and a 5# contact of the direct current relay KA 3; one end of each of the push-button switch S1, the push-button switch S2 and the push-button switch S3 is connected with the 0V output end of the auxiliary power supply DS1, and the other ends of the push-button switch S1, the push-button switch S2 and the push-button switch S3 are correspondingly connected with a pin 13# of the direct-current relay KA1, a pin 13# of the direct-current relay KA2 and a pin 13# of the direct-current relay KA3 respectively; the 1# contact of the direct current relay KA1, the 1# contact of the direct current relay KA2 and the 1# contact of the direct current relay KA3 are suspended; the 9# contact of the direct-current relay KA1, the 9# contact of the direct-current relay KA2 and the 9# contact of the direct-current relay KA3 are respectively connected with the +24V output end of the auxiliary power supply DS 1; the 4# contact of the direct current relay KA1 is connected with the 14# pin of the direct current relay KA2, the 8# contact of the direct current relay KA1, the 14# pin of the direct current relay KA4 and the 8# contact of the direct current relay KA2 are connected together, the 12# contact of the direct current relay KA1, the 12# contact of the direct current relay KA2 and the 4# contact of the direct current relay KA3 are connected together, the 14# pin of the direct current relay KA1 is connected with the 4# contact of the direct current relay KA2, the 8# contact of the direct current relay KA3 is suspended, the 12# contact of the direct current relay KA3 is connected with the +24V output end of the auxiliary power supply DS1, the 14# pin of the direct current relay KA3 is connected with the 4# contact of the direct current relay KA4, the 1# contact, the 5# contact, the 8# contact and the 9# contact of the direct current relay KA4 are suspended, and the 12# contact of the direct current relay KA4 is connected with the auxiliary power supply DS1, and a pin 13# of the direct-current relay KA4 is connected with a 0V output end of the auxiliary power supply DS 1.

Working principle of circuit

As shown in fig. 4, the internal wiring schematic diagram of the dc relay KA1, the dc relay KA2, the dc relay KA3 and the dc relay KA4 is shown, the dc relay has two synchronous normally closed switches and normally open switches, the 9# contact and 12# contact are common terminals, when the 13# pin and the 14# pin of the coil are not powered: the 1# contact is connected with the 9# contact, the 5# contact is disconnected with the 9# contact, the 4# contact is connected with the 12# contact, and the 8# contact is disconnected with the 12# contact; when the pin 13# and the pin 14# of the coil are powered: the 1# contact is disconnected with the 9# contact, the 5# contact is connected with the 9# contact, the 4# contact is disconnected with the 12# contact, and the 8# contact is connected with the 12# contact; the normally closed switch and the normally open switch are in a mutual exclusion relation, namely when the normally closed switch is switched on, the normally open switch is necessarily in a disconnected state, and the working logic provides basic conditions for realizing interlocking control.

As shown in fig. 5, the internal wiring schematic diagram of the dc contactor KM1, the dc contactor KM2, and the dc contactor KM3 is that the a1 contact and the a2 contact of the dc contactor are the first switch, the A3 contact and the a4 contact are the second switch, the 1# and the 2# are the auxiliary switches, and the working logics of the first switch, the second switch, and the auxiliary switch are synchronous, that is, when the 3# pin and the 4# pin of the coil are not powered: the first switch, the second switch and the auxiliary switch are all switched off, and when the 3# pin and the 4# pin of the coil supply power: the first switch, the second switch and the auxiliary switch are all closed.

Continuing to refer to fig. 3, the initial state button switches S1, S2, and S3 are all in an off state, the 5# contacts and the 9# contacts of the dc relays KA1, KA2, and KA3 are all off, the corresponding dc contactors KM1, KM2, and KM3 are not powered on, and at this time, none of the three loads is connected to the power supply loop.

1. When a first load is required to be connected into the loop, the button switch S1 is connected, the power supply loop of the coil of the direct current relay KA1 is closed, the contact 5# and the contact 9# of the direct current relay KA1 are connected to provide +24V power for the coil of the direct current contactor KM1, all switches of the direct current contactor KM1 are connected simultaneously, the indicator light LED1 is normally on, and the first load is connected into the main loop; meanwhile, the 4# contact of the direct current relay KA1 is disconnected with the 12# contact, a coil anode power supply loop of the direct current relay KA2 is cut off, the direct current relay KA18# contact is connected with the 12# contact to provide +24V power for a direct current relay KA4 coil, the 4# contact is disconnected with the 12# contact after the direct current relay KA4 coil supplies power, and the coil power supply loop of the direct current relay KA3 is cut off, even if the button switches S2 and S3 are connected at the moment, the coil power supply loops of the direct current relay KA2 and the direct current relay KA3 are not complete, so that the direct current contactor KM2 and the direct current contactor KM3 cannot be connected and are always in a disconnected state, and therefore when the direct current contactor KM1 is connected, the power supply loops of the direct current contactor KM2 and the direct current contactor KM3 are both cut off, and the phenomenon that three loads are simultaneously connected is completely avoided;

2. when a second load is required to be connected into the loop, the three button switches S1, S2 and S3 are all restored to an initial off state, then the button switch S2 is switched on, a coil power supply loop of the direct current relay KA2 is closed, a contact 5# and a contact 9# of the direct current relay KA2 are switched on to provide +24V power for a coil of the direct current contactor KM2, all switches of the direct current contactor KM2 are switched on simultaneously, an indicator light LED2 is normally on, and the second load is connected into the main loop; meanwhile, a 4# contact and a 12# contact of the direct current relay KA2 are disconnected, a coil anode power supply loop of the direct current relay KA1 is cut off, a 8# contact and a 12# contact of the direct current relay KA2 are connected to provide +24V power for a coil of the direct current relay KA4, the 4# contact and the 12# contact are disconnected after the coil of the direct current relay KA4 supplies power, and a coil power supply loop of the direct current relay KA3 is cut off, even if the button switches S1 and S3 are connected at the moment, the coil power supply loops of the direct current relay KA1 and the direct current relay KA3 are incomplete, the direct current contactor KM1 and the direct current contactor KM3 cannot be connected and are always in a disconnected state, so that when the direct current contactor KM2 is connected, the power supply loops of the direct current contactor KM1 and the direct current contactor KM3 are all cut off, and the phenomenon that three loads are connected at the same time is completely avoided;

3. when a third load is required to be connected into the loop, the three button switches S1, S2 and S3 are all restored to an initial off state, then the button switch S3 is switched on, a power supply loop of a coil of the direct-current relay KA3 is closed, a contact 5# and a contact 9# of the direct-current relay KA3 are switched on to provide +24V power for a coil of the direct-current contactor KM3, all switches of the direct-current contactor KM3 are switched on simultaneously, an indicator light LED3 is normally on, and the third load is connected into the main loop; meanwhile, the 4# contact and the 12# contact of the direct current relay KA3 are disconnected, the power supply loops of the coil anodes of the direct current relay KA1 and the direct current relay KA2 are cut off, even if the button switches S1 and S2 are switched on at the moment, the power supply loops of the direct current relay KA1 and the coil anodes of the direct current relay KA2 are not complete, the direct current contactor KM1 and the direct current contactor KM2 cannot be switched on and are always in a disconnected state, and therefore when the direct current contactor KM3 is switched on, the power supply loops of the direct current contactor KM1 and the direct current contactor KM2 are all cut off, and the phenomenon that three loads are switched on simultaneously is thoroughly avoided.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A three-way interlocking high-voltage circuit protection control device is characterized by comprising: the high-power direct-current power supply comprises a shell (10), a direct-current load wiring terminal (11), a high-power direct-current power supply input terminal (12), a socket (13), a button switch S1, a button switch S2, a button switch S3, an indicator light LED1, an indicator light LED2 and an indicator light LED 3; one end of the shell (10) is provided with a direct current load wiring terminal (11), and the other end of the shell (10) is provided with a high-power direct current power supply input terminal (12); a contactor main circuit, a relay control circuit and an auxiliary power supply DS1 are installed inside the shell (10), the output end of the auxiliary power supply DS1 is connected with the contactor main circuit and the relay control circuit respectively, the relay control circuit is connected with the contactor main circuit in an interlocking manner, the input end of the contactor main circuit is connected with a high-power direct-current power supply input terminal (12), and the output end of the contactor main circuit is correspondingly connected with a direct-current load wiring terminal (11); a socket (13) is arranged on one side of the shell (10), and the socket (13) is connected with the input end of an auxiliary power supply DS 1; button switch S1, button switch S2, button switch S3, pilot lamp LED1, pilot lamp LED2, pilot lamp LED3 install the upper cover plate at casing (10), button switch S1, button switch S2, button switch S3 be connected with relay control circuit respectively, pilot lamp LED1, pilot lamp LED2, pilot lamp LED3 be connected with the contactor main circuit respectively.

2. The three-way interlocking high voltage circuit protection control device according to claim 1, wherein said contactor main circuit comprises: a direct current contactor KM1, a direct current contactor KM2 and a direct current contactor KM 3; the direct current contactor KM1, the direct current contactor KM2, an A1 contact and an A3 contact of the direct current contactor KM3 are connected with a high-power direct current power supply input terminal (12); the direct-current load wiring terminal (11) is correspondingly connected with the A2 contact and the A4 contact of the direct-current contactor KM1, the direct-current contactor KM2 and the direct-current contactor KM3 respectively; and 3# pins of the direct current contactor KM1, the direct current contactor KM2 and the direct current contactor KM3 are connected with the negative electrode of the output end of the auxiliary power supply DS 1.

3. A three-way interlocking high voltage circuit protection control device according to claim 2, wherein said relay control circuit comprises: the relay system comprises a direct-current relay KA1, a direct-current relay KA2, a direct-current relay KA3 and a direct-current relay KA 4; the 4# pins of the direct current contactor KM1, the direct current contactor KM2 and the direct current contactor KM3 are correspondingly connected with the 5# contacts of the direct current relay KA1, the direct current relay KA2 and the direct current relay KA3 respectively; 9# contacts of the direct current relay KA1, the direct current relay KA2 and the direct current relay KA3 are respectively connected with the anode of the output end of the auxiliary power supply DS 1; 1# contacts of the direct current relay KA1, the direct current relay KA2 and the direct current relay KA3 are all suspended; the 4# contact of the direct current relay KA1 is connected with the 14# pin of the direct current relay KA2, the 8# contact of the direct current relay KA1, the 14# pin of the direct current relay KA4 and the 8# contact of the direct current relay KA2 are connected together, the 12# contact of the direct current relay KA1, the 12# contact of the direct current relay KA2 and the 4# contact of the direct current relay KA3 are connected together, the 14# pin of the direct current relay KA1 is connected with the 4# contact of the direct current relay KA2, the 8# contact of the direct current relay KA3 is suspended, the 12# contact of the direct current relay KA3 is connected with the anode of the output end of the auxiliary power supply DS1, the 14# pin of the direct current relay KA3 is connected with the 4# contact of the direct current relay KA4, the 1# contact, the 5# contact, the 8# contact and the 9# contact of the direct current relay 4 are suspended, and the 12 contact of the auxiliary power supply KA1 of the direct current relay KA4 is connected with the output end of the auxiliary power supply DS1, and a pin 13# of the direct-current relay KA4 is connected with the negative electrode of the output end of the auxiliary power supply DS 1.

4. The protection control device for the three-way interlocking high-voltage circuit as claimed in claim 2, wherein one end of each of the indicator light LED1, the indicator light LED2 and the indicator light LED3 is connected to the positive terminal of the output terminal of the auxiliary power supply DS1, the other end of each of the indicator light LED1, the indicator light LED2 and the indicator light LED3 is correspondingly connected to the 1# contact of the dc contactor KM1, the dc contactor KM2 and the dc contactor KM3, and the 2# contact of each of the dc contactor KM1, the dc contactor KM2 and the dc contactor KM3 is connected to the negative terminal of the output terminal of the auxiliary power supply DS 1.

5. The three-way interlocking high-voltage circuit protection control device of claim 3, wherein one end of each of the push-button switch S1, the push-button switch S2 and the push-button switch S3 is connected to the negative terminal of the output terminal of the auxiliary power supply DS1, and the other end of each of the push-button switch S1, the push-button switch S2 and the push-button switch S3 is connected to the 13# pin of the DC relay KA1, the DC relay KA2 and the DC relay KA3 respectively.

6. A protection circuit for use in a three-way interlocked high-voltage circuit protection control device as claimed in any one of claims 1 to 5, comprising: the contactor control circuit comprises a contactor main circuit, a relay control circuit and an auxiliary power supply DS1, wherein the output end of the auxiliary power supply DS1 is respectively connected with the contactor main circuit and the relay control circuit, and the relay control circuit is connected with the contactor main circuit in an interlocking mode.

7. The protection circuit according to claim 6, wherein the contactor main circuit comprises: a direct current contactor KM1, a direct current contactor KM2 and a direct current contactor KM 3; the direct-current contactor KM1, the direct-current contactor KM2, the A1 contact and the A3 contact of the direct-current contactor KM3 are connected with a high-power direct-current power supply input terminal (12); the direct-current load wiring terminal (11) is correspondingly connected with the A2 contact and the A4 contact of the direct-current contactor KM1, the direct-current contactor KM2 and the direct-current contactor KM3 respectively; and 3# pins of the direct current contactor KM1, the direct current contactor KM2 and the direct current contactor KM3 are connected with the negative electrode of the output end of the auxiliary power supply DS 1.

8. The protection circuit of claim 7, wherein the relay control circuit comprises: the relay system comprises a direct-current relay KA1, a direct-current relay KA2, a direct-current relay KA3 and a direct-current relay KA 4; the 4# pins of the direct current contactor KM1, the direct current contactor KM2 and the direct current contactor KM3 are correspondingly connected with the 5# contacts of the direct current relay KA1, the direct current relay KA2 and the direct current relay KA3 respectively; 9# contacts of the direct current relay KA1, the direct current relay KA2 and the direct current relay KA3 are respectively connected with the anode of the output end of the auxiliary power supply DS 1; 1# contacts of the direct current relay KA1, the direct current relay KA2 and the direct current relay KA3 are all suspended; the 4# contact of the direct current relay KA1 is connected with the 14# pin of the direct current relay KA2, the 8# contact of the direct current relay KA1, the 14# pin of the direct current relay KA4 and the 8# contact of the direct current relay KA2 are connected together, the 12# contact of the direct current relay KA1, the 12# contact of the direct current relay KA2 and the 4# contact of the direct current relay KA3 are connected together, the 14# pin of the direct current relay KA1 is connected with the 4# contact of the direct current relay KA2, the 8# contact of the direct current relay KA3 is suspended, the 12# contact of the direct current relay KA3 is connected with the anode of the output end of the auxiliary power supply DS1, the 14# pin of the direct current relay KA3 is connected with the 4# contact of the direct current relay KA4, the 1# contact, the 5# contact, the 8# contact and the 9# contact of the direct current relay 4 are suspended, and the 12 contact of the auxiliary power supply KA1 of the direct current relay KA4 is connected with the output end of the auxiliary power supply DS1, and a pin 13# of the direct-current relay KA4 is connected with the negative electrode of the output end of the auxiliary power supply DS 1.

9. The protection circuit according to claim 7, wherein one end of each of the indicator light LED1, the indicator light LED2 and the indicator light LED3 is connected to a positive electrode of an output terminal of an auxiliary power supply DS1, the other ends of the indicator light LED1, the indicator light LED2 and the indicator light LED3 are correspondingly connected to # 1 contacts of the DC contactor KM1, the DC contactor KM2 and the DC contactor KM3, and # 2 contacts of the DC contactor KM1, the DC contactor KM2 and the DC contactor KM3 are connected to a negative electrode of an output terminal of the auxiliary power supply DS 1.

10. The protection circuit of claim 8, wherein one end of each of the push-button switches S1, S2 and S3 is connected to the negative terminal of the output terminal of the auxiliary power source DS1, and the other ends of each of the push-button switches S1, S2 and S3 are respectively connected to the # 13 pins of the dc relays KA1, KA2 and KA 3.